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Heat half the oil in a frying pan and gently cook the onion for approx. 5-10 minutes until soft, remove from the heat and allow to cool
Using a food processor, finely chop the spinach along with the cooled onion, breadcrumbs, cheddar and parmesan. Add to a bowl and mix together. Add the beaten egg and mix again until the mixture holds together. Divide into 4 equal amounts and shape into burgers
Put the flour in a shallow bowl, season well and dip the burgers into the flour to coat
Pre-heat the grill to maximum. Cook the burgers for 6-10 minutes until golden brown